package createadvancedstage;

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.effect.Lighting;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.paint.CycleMethod;
import javafx.scene.paint.RadialGradient;
import javafx.scene.paint.Stop;
import javafx.scene.shape.Circle;
import javafx.scene.text.Font;
import javafx.scene.text.Text;
import javafx.scene.text.TextBoundsType;
import javafx.stage.Stage;
import javafx.stage.StageStyle;

/**
 * A sample with a control that creates a transparent stage that is centered on
 * your desktop. You can drag the stage with your mouse or use the scene
 * controls to minimize or close it. With a transparent stage, you must add
 * your own event handlers to perform these actions.
 */
public class CreateAdvancedStage extends Application {
    //variables for storing initial position of the stage at the beginning of drag
    private double initX;
    private double initY;

    private void init(Stage primaryStage) {
        Group root = new Group();
        primaryStage.setScene(new Scene(root));
         //create a button for initializing our new stage
        Button button = new Button("Create a Stage");
        button.setStyle("-fx-font-size: 24;");
        button.setDefaultButton(true);
        button.setOnAction(t -> {
            // INITIALISATION OF THE STAGE/SCENE

            //create stage which has set stage style transparent
            final Stage stage = new Stage(StageStyle.TRANSPARENT);
            //create root node of scene, i.e. group
            Group rootGroup = new Group();
            //create scene with set width, height and color
            Scene scene = new Scene(rootGroup, 200, 200, Color.TRANSPARENT);
            //set scene to stage
            stage.setScene(scene);
            //center stage on screen
            stage.centerOnScreen();
            //show the stage
            stage.show();

            // CREATION OF THE DRAGGER (CIRCLE)

            //create dragger with desired size
            Circle dragger = new Circle(100, 100, 100);
            //fill the dragger with some nice radial background
            dragger.setFill(new RadialGradient(-0.3, 135, 0.5, 0.5, 1, true, CycleMethod.NO_CYCLE, new Stop(0, Color.DARKGRAY),
                    new Stop(1, Color.BLACK)));


            //when mouse button is pressed, save the initial position of screen
            rootGroup.setOnMousePressed(me -> {
                initX = me.getScreenX() - stage.getX();
                initY = me.getScreenY() - stage.getY();
            });

            //when screen is dragged, translate it accordingly
            rootGroup.setOnMouseDragged(me -> {
                stage.setX(me.getScreenX() - initX);
                stage.setY(me.getScreenY() - initY);
            });

            // CREATE MIN AND CLOSE BUTTONS
            //create button for closing application
            Button close = new Button("Close me");
            close.setOnAction(event -> {
                //in case we would like to close whole demo
                //javafx.application.Platform.exit();

                //however we want to close only this instance of stage
                stage.close();
            });

            //create button for minimalising application
            Button min = new Button("Minimize me");
            min.setOnAction(event -> stage.setIconified(true));


            // CREATE SIMPLE TEXT NODE
            Text text = new Text("JavaFX"); //20, 110,
            text.setFill(Color.WHITESMOKE);
            text.setEffect(new Lighting());
            text.setBoundsType(TextBoundsType.VISUAL);
            text.setFont(Font.font(Font.getDefault().getFamily(), 50));

            // USE A LAYOUT VBOX FOR EASIER POSITIONING OF THE VISUAL NODES ON SCENE
            VBox vBox = new VBox();
            vBox.setSpacing(10);
            vBox.setPadding(new Insets(60, 0, 0, 20));
            vBox.setAlignment(Pos.TOP_CENTER);
            vBox.getChildren().addAll(text, min, close);

            //add all nodes to main root group
            rootGroup.getChildren().addAll(dragger, vBox);
        });

        root.getChildren().add(button);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        init(primaryStage);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

